/*
 * Copyright (c) 2008, 2012, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package test.output;

import java.util.concurrent.*;

/**
 * A simple test that uses {@link java.util.concurrent.ArrayBlockingQueue}.
 */
public class BlockingQueue {
    public static final int MESSAGES = 5;

    public static void main(String[] args) throws InterruptedException {
        int messages = MESSAGES;
        if (args.length > 0) {
            messages = Integer.parseInt(args[0]);
        }
        final ArrayBlockingQueue<Integer> queue = new ArrayBlockingQueue<Integer>(messages);
        final Consumer consumer = new Consumer(queue, messages);
        final Producer producer = new Producer(queue, messages);
        consumer.start();
        producer.start();
        consumer.join();
        producer.join();
        System.out.println("Done.");
    }

    static class Producer extends Thread {
        final ArrayBlockingQueue<Integer> queue;
        final int messages;
        Producer(ArrayBlockingQueue<Integer> queue, int messages) {
            super("Producer");
            this.queue = queue;
            this.messages = messages;
        }
        @Override
        public void run() {
            for (int i = 0; i < messages; i++) {
                queue.add(i);
                try {
                    Thread.sleep(20);
                } catch (InterruptedException e) {
                    // do nothing.
                }
            }
        }
    }

    static class Consumer extends Thread {
        final ArrayBlockingQueue<Integer> queue;
        final int messages;
        Consumer(ArrayBlockingQueue<Integer> queue, int messages) {
            super("Consumer");
            this.queue = queue;
            this.messages = messages;
        }
        @Override
        public void run() {
            for (int i = 0; i < messages; i++) {
                try {
                    System.out.println(queue.take());
                    Thread.sleep(10);
                } catch (InterruptedException e) {
                    // do nothing.
                }
            }
        }
    }
}
